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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1cd8ab4157c77c6673389f0bf9078d9963739f85acef0531a6a06597f19e1bf' 
  AND token = 'RXAoMU0a3ypkxCNbM3L7jcryifq67zqmnbBJhY//Lgw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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