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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be773936b1df1474b0bfd9bc961b5eb4d525836e6665ce006a6c721e0b81d9bb' 
  AND token = '6Qen+91lai7DJimC5DMlPJBZIa2yWXw8oGUK95Tqg1Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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