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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1bfb5dc6126b37009987ecac1e9107a85c1b3fbc151f284edc6d955c749e100d' 
  AND token = 'Eo88mz3iKFOy6YhLkU9tSG68IT4+ch77xH7aEgSpbdo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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