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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eea1a2c1600e201c256d4b0c3680aa3d27dbe244e5c8139ab215f2753593c04d' 
  AND token = 'hBLGQvM50Rutt1NI677lwchB1ZaX7Af5jNq+WPRzMFU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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