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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ba08066d673cf0fb63e8eec6a0d64918a7c99309e929ec2d9243b5662c91ba9' 
  AND token = 'Z0D7qudzgh3emFVAhWSAXYVOsXxFk1Ojm973JyJwn3g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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