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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d0487e7c6372c63d495aaaf01a0871fc266b6e488df535fe8d4804794847a06' 
  AND token = 'cXIpkOw5DCtw/83NFaGGAE8FD1jpDjpOCxxT86bOb9c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}