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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d996cd339d62d425da0437809157290b74328f26796b65df709ccebce3e0a7b' 
  AND token = 'OMfH3wLPld/+gkmtdVbg41T8k3isz8UQObbHJh5LqmM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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