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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34418f05f9cdaa85bccd761161ec1e95447d49cec493104c7961746b67bbbdaf' 
  AND token = '/AQrMdZK6glJTTM6nnejDg7L/pBDVGGLIIFFbeYTdUU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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