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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84366d6451627b8aa68e7917df8aff9bb9f303569af55b8b6afe927b2bbe0e0a' 
  AND token = 'QxMWxaRG170/gxbRObwcd+Yu764Y2mwUdtZYSKOktg0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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