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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1623906c5fb4c140ca55dc0d04b9d8e751bb44f3d35b8e21ba49bbe7fccc6b63' 
  AND token = '5HfEhrawaHn5mBDadtBv7cPjXCy1C4cgD5El48yHPb8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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