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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '81eaa7275cc234fda8965fdd6024ca70389c7c21c413bcd00afcc6991770d2ab' 
  AND token = '2UDuyoMoiU3M5fzyKGsSLMuO4WecHgch51VultpkV7I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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