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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0436894616ff22427c5108e74fe8c99872f50ce1c12843b209ae7a90551c18a' 
  AND token = 'bfuDvtD7wipun0wUoRz0dy0IJ5AgVytUY8wBa9vzuQU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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