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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '12cc1d30ac69d2e3b01d6d32512f53b3b894d77f9a2331466912ef7bcc2958d9' 
  AND token = '7Gjlswqy53Bk92DWuEYl1PUTigSrPYDl0q3GY9vsxHo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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