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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99aecdce5be4a0cfc25511e7cb396fc6ede508b063154d818fee36939c1c7cb8' 
  AND token = 'N0uoarrpKtCE4wz9/ZpP79/dazhfiCs7V2Vu/rRYtWM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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