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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7d44a4bf7352d562d958ca0f4ed26f5fe3c225429074a7395ed18804f3c3d32' 
  AND token = 'N8MWRUYC4TQex0CJORbbCceTHwPRTRbrgq/Zxf3hU78=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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