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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02333588d10ef639326cd8e8420e7eccd40f3bfd6eaeb72e6b3c7dc1277ce3f6' 
  AND token = 'sCQEkd6aYFwwhfhj0z0wWkmWPVBqvCU9q9AOPl2oBsQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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