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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ef64b566d4a65ea0613a3628c17d51d27c11e41ec11f408cce088d62eb6f01d' 
  AND token = 'zAUbGQcxV1qH0td5GeKFh5V3HdBp7M7EdeqH/EVQFro=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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