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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7b30d3556ae71e751b50eeb5bffc111c25ebe1a6cfa921526669eef41676849' 
  AND token = 'esjyvmHq5d1kr8Sx62dkamEj4XAacAtxa2bO7pTLTDg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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