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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3f72ff9fd2e7a96e18e73549a8c58ecde60bc4b2b3bee3ec8f4bd5bf8ff06de' 
  AND token = 'wDS470lqNIj6y+LZo5lB3I+bP9m52mMFVSvnx7l1NUQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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