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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68ebbe0f4cc747ea33341ea3a5c4f3923c6baa6ae87073bf6d7e99f33add0e2a' 
  AND token = 'kGvEi6+eChW4kz0HAcyo0KwmHLAPVjccVye6xWwods4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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