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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd8ce242ab6af9ab1fb36347aa9740b0194d89a45e99e19572189a05ed72dab8' 
  AND token = 'xraSy4Gg1YV9Ea69uL6/anwR6cBD2Li7A/ZeJwmk36c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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