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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'efb6ee5655a8e453db93c43f536e33129a97dea556cde5df2747b9f483603c03' 
  AND token = '2jAGTrRbrVm9khJQiX9Jgg23X+b88y/TlToK/3P3JVE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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