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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85f712e3cafcc0be4791eca4c873208b18f4ca88655064e2d4b63408ad6892d1' 
  AND token = 'vsBM9r82uma2dQzJJRxyasZZLKNICRxMCkODYvdfQB8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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