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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4bee19826d9bd6a13e0c3bedbf7e24d84b2a91e967bf060f406660d682cdb2d7' 
  AND token = 'jk4evhN4TWz+iWquTvaQ7GTU7djixBMPwD0qHsaunug=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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