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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '206a0cc7f91693318d3edb8675466aa9937e503eaee0707094d5f23c6a8e6ace' 
  AND token = 'p079WXIxBN4wPesmk8fj2cV+zIILVYa2knWINJvcbkw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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