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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f1c85367d10941e0ca5c09ee84fb51a9b7c94e9671daed2f1c67fde1eba073ec' 
  AND token = 'Yskq1r36akhdEyC71ctu3yV63woV02QOyGSRmYqsqz4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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