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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '880ce678c20e4fad1e2d608aac0a52815ae3e4d83537bf99b1fccbac9e2faeba' 
  AND token = '3XddndY8j7TZgzWOamjy3CMplVeIg2t6AjOAbdlh33s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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