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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5fc6030b4b9a8d928215c6c77a4ef301ed66e06ba06d8e2c218a85e92eb84f06' 
  AND token = '1OHAV2Le6GJp+kAKElM382ve8oM+QTnKzt6WZTQxNcc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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