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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77555ade3ca7b68ccebbbda1ef9851a04ec7d9ec97b1a6e5e59e4bdeef911513' 
  AND token = 'NFkALdbnGhnVlDznuA80uXE75ISU+AQenBaZAg/dALQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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