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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c90787f9c331acd3157a128f7157d0d4fb3da69c3efc8e634420e280e564a47e' 
  AND token = 'AieZm/Wl6byKzrodn2LJvlL7a4BKSrrqISwwOcCBj4M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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