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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f59b70c72e6388bd0425df49865c17192c573ad18bd27a953170340305a454b' 
  AND token = 'gC2Xfq77gHLG6IPj6eZiI0GILk+ad5464mXjbVxdcQc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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