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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fdafbd2d3a8946d9dbb79ffd2c35ed6e35d3b364e1a59dedc174787d79ece77d' 
  AND token = 'aM/OANpU7TM9OgzZf2u6q7O3Ws0kvxSDKCK9bqrQnSM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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