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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90280f89d2af21379ab51a34247864b0d83055453092d32094ce364904146ab1' 
  AND token = 'HCVWK0mLBY0tHF5JLeTd6sh2eipHJlDDWMovJVw+k8E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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