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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b84871a19e088aa9b6b4efd2de53b6d4739fdc3159224f0db7ba03bd054d9e06' 
  AND token = 'L6D+k3pXcqberNrGH9Tmnf5zcx6Uc61UAE+un3iPvY8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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