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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4e233aaa0f06adf2ceef82b2a75a56aa23ac18369ab8e79cfa1dfe06cf6de70' 
  AND token = 'hIVizgFiuOomyrrne6ipFcm8M7y7TysTogsuFNrZqMk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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