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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06f818c381bea64b8f40da6e82ae36b571af26a59843b92675c8cfc91d7192d8' 
  AND token = 'qi8m81MR/9wx89qDF/E6b+dDUzjwq5kMAokbvnLRB0E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00081

JSON explain

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