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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73950136f2c13e39b5265bcd1e2ec4c987ca5ca1ca39e72576923bb3fad6b3c8' 
  AND token = 'csOPlNj9l6BLYSkmmso4VNKrCgkq7aeuGXGHkLIG18g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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