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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f911cbc489788849e375f3c2053a58e8bcd88a207fb5369726e27354ca758994' 
  AND token = 'OcwD+u09wYTETO6KTWsKFfrHOOYTvi5IPYMVfdxsjaw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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