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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a05aafba3a5996f04058c42a0ed76c6599dfae54ccdc5d91aaa61295b2e8865c' 
  AND token = 'tMnxXdSUeURJ3qTTY9RL3/ad7KE+ATnq/sr44xeP6+M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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