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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ced6090ee16081e3eee0a7e9f4c915d562583ba89231303a798b924c7b0f3ba' 
  AND token = 'MravHIoA1CJXwLuM3bvNJsUQrNm6tceGC22s7B+Wl54=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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