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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f52581dac8b886fcec2f4b0e35da977a4a0aac1231e736bdf93aa64a544bdf0' 
  AND token = '3e4L1wS9DE1KZTonW3Hs+O0wpi31z1cnHuQS4R5RGz8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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