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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ebe34b5d1d3a5830273aa36ece92349b9545a7a22bf7e965e4e8c9e52d59529a' 
  AND token = 'O6hHN+vNI3bCDX83iPZ+TdL7OFnULvGZ3Rma8xqqmoc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00010

JSON explain

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