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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'adf469776113bd14e3887ce6fad7bcf58dd352a936c02c445b477e074ee3f2da' 
  AND token = 'cVps5YL8UiwGRoM4TmxGBTw/JUEP59P4o4T95q/4VGc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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