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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4970caf95567ac060b02c00cc69e5c6addd4c3da527c4e13be99ec61cef7049' 
  AND token = 'ZZimp6aosFdxZb8Db70QdFfz3Fg0++U2eQSdXjesvns=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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