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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b55f5984abbfc150777e6cc1c788553cc24478438cfea5e9dda0a89d1017cbfb' 
  AND token = '4oBUAgZcMcYvNlOIdNxlgAUl83Pb6oPONrY1iZ645w4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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