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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '18f8813d9f2b01c43283691134a47bff8ba0faa9c0f7797f694777fe7d5ab550' 
  AND token = '5d53tsJwEsQNBZn+coTj3JgnksA0bJ3KbwepvFwz0fc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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