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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b26798f4eeb8c133a5ae562f7668880e6f2aa1e9d56a0c39dff97bc4ab8ac2b' 
  AND token = 'PlsmhHrVREHlJ+psRUaxcoj8BrYaiyt1SHc/kCJT3O0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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