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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'afcdf02b7d36ec215af3dbf77b1c3eed8a28f2465f4861b8c4f4d199164779bf' 
  AND token = 'fh0lR5U/OrIBz/kBJhbCcTNl29jaHwWcsURj6KKcfoI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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