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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5963b5ea45b788fec357387615baad8258d2b1e7f41875fb1ef0110731ab907e' 
  AND token = '3KU+OfzikRG1BtSzi1t8grw2gOKL5vpZugnLR5r8FkU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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