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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '424c6217121b14d03c478c501093c5603fb7d7850ba273665c0968d7864d963c' 
  AND token = 'zN4k3nUVgfKob5kMF/zavMcxvf5KqxegW1M9UYqYPPY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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