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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7bcff21b17354a5fcfa9fcdf4c0b40f8f8e79df168253d9bee071371ee9cd297' 
  AND token = '72Yxs1iplUXxMW4mEXWhyYktO6JfeFWGsKaAv9MrPJo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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