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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef5fe592346e6b255d9f4a4ba7fb5c76a4ff4733447a3deae7b4160eae311e0a' 
  AND token = 'ma/sJ0e9or+AW1wDx1c1nBgxMCerdjpBkyD9zRC+dh0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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