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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8985b95b3dc93677870095fea311ffd05c3b36d6e0a0205d4a34468a880d2426' 
  AND token = 'fdh6c1M7kMB59+ocPBlyDJ0MMKb/vzX9pFZpDDWR0+A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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