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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56954a4e4bb7d6da417418d47a6ecc013b9d4d766ff4f16373cffa39a65b828f' 
  AND token = 'BhAmBGiagI7vs9A0okHQyp+J8IxnWI+8O7aQjufYmQ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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