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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94d8f15783cbea6ebcb14f68e80efec30d3d6957327c36a06d7d99efbcbbe82c' 
  AND token = 'cvLLKs5m3gOoT66P+QALgu8vP97nXlseo0Kbmn/YkPk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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