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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ee39384e7a89dfaf7744797f3735aac956dc34b4f3e80b3c4e041b0a23ae70c' 
  AND token = 'NhrJ6mvZd+23tw7ropixS6PA/xp8RilZORPlEUzGbO4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00059

JSON explain

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