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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '57b97b06c97c9dd8e9d57b42ae0c152f1ed038523ea2ffa36389050464b7b2f7' 
  AND token = '2gPwSLP9rpfn6RCNKIaO6rJJdlKZjw0FKAcMYthcm0k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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