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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '81d6b8a9eee546111c828f89da47f80eea48dc59cf52aab89f64b95653f63dfc' 
  AND token = 'okVAIxO+SEL6EAhhIPJxF6d/SCQ2g0jTkWommsr/3ws=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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